Small UV flahlights about 9-LEDs are cheap from hong kong these days (under 5 dollar or euro) and really useful for glass ID. But I would would expect if your piece has uranium glass it will fluoresce green quite a bit even just next to an open window. Looks like it does even from the photo.

I have a blue one of these with the same shape. Mushroom posy bowl - it would have had a round glass flower holder with holes (called a 'frog') in the middle. I believe it's Davidson glass, English. They made them in the 1930s and again in the 50s.